Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 9: Posters 1: Dichroism, VUV and Xray, Clusters, and Cold Molecules
MO 9.8: Poster
Tuesday, March 7, 2017, 17:00–19:00, P OG1
Imaging of the He2 wave function using a free electron laser — •Stefan Zeller1, Maksim Kunitski1, Jörg Voigtsberger1, Anton Kalinin1, Alexander Schottelius1, Carl Schober1, Markus Waitz1, Hendrik Sann1, Alexander Hartung1, Tobias Bauer1, Martin Pitzer1, Florian Trinter1, Christoph Goihl1, Christian Janke1, Martin Richter1, Gregor Kastirke1, Miriam Weller1, Achim Czasch1, Markus Braune2, Robert E. Grisenti1,3, Lothar Ph. H. Schmidt1, Markus S. Schöffler1, Joshua B. Williams4, Till Jahnke1, and Reinhard Dörner1 — 1Institut fuer Kernphysik, Goethe-Universitaet Frankfurt, 60438 Frankfurt, Germany — 2Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany — 3GSI Helmholtz Centre for Heavy Ion Research, 64291 Darmstadt, Germany — 4Department of Physics, University of Nevada, Reno, NV 89557, USA
We report on Coulomb explosion imaging of the wavefunction of the quantum halo system He2. Each atom of this system is ionized by tunnel ionization in a femto second laser pulse and in a second experiment by single photon ionization employing a free electron laser. We visualize the exponential decay of the probability density of the tunneling particle over distance for over two orders of magnitude up to an internuclear distance of 250 Å. By fitting the slope of the density in the tunneling regime we obtain a binding energy of 151.9 ± 13.3 neV, which is in agreement with most recent calculations [Przybytek et al.,PRL 104, 183003, 2010].